<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script src="./js/vue.js"></script>
    <div id='app'>
       <p>FirstName:<input type="text" v-model="firstName"></p>
       <p>LastName:<input type="text" v-model="lastName"></p>
       <p>fullname:{{fullname}}</p>
       <button @click="change">改变fullname</button>
    </div>
    
    <script>
        let app =new Vue({
             el:"#app",
             data:{
                firstName:'',
                lastName:''
             },
             methods:{
                change(){
                    this.fullname="Harry Potter";
                }
             },
             computed:{
                fullname:{
                    //输入框输入调用getter，进而更新视图，
                    get:function(){
                        return this.firstName+"  "+this.lastName;
                    },
                    //点击改变按钮，执行change方法，改变fullname，此时调用setter，进而更新视图
                    set:function(newVal){
                        var arr =newVal.split(' ');
                        this.firstName=arr[0];
                        this.lastName=arr[1]
                    }
                }
             }
        })
    </script>
</body>
</html>